EP3924552B1 - Fraise à neige pour la préparation de pistes de ski - Google Patents

Fraise à neige pour la préparation de pistes de ski Download PDF

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Publication number
EP3924552B1
EP3924552B1 EP20705119.4A EP20705119A EP3924552B1 EP 3924552 B1 EP3924552 B1 EP 3924552B1 EP 20705119 A EP20705119 A EP 20705119A EP 3924552 B1 EP3924552 B1 EP 3924552B1
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EP
European Patent Office
Prior art keywords
snow
pressure bar
casing
tiller
longitudinal axis
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Application number
EP20705119.4A
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German (de)
English (en)
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EP3924552C0 (fr
EP3924552A1 (fr
Inventor
Markus UNTERHOLZNER
Stefan HOCHRAINER
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Prinoth SpA
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Prinoth SpA
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Publication of EP3924552B1 publication Critical patent/EP3924552B1/fr
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H4/00—Working on surfaces of snow or ice in order to make them suitable for traffic or sporting purposes, e.g. by compacting snow
    • E01H4/02—Working on surfaces of snow or ice in order to make them suitable for traffic or sporting purposes, e.g. by compacting snow for sporting purposes, e.g. preparation of ski trails; Construction of artificial surfacings for snow or ice sports ; Trails specially adapted for on-the-snow vehicles, e.g. devices adapted for ski-trails

Definitions

  • the present invention relates to a snow tiller for the preparation of ski runs.
  • a snow tiller for the preparation of ski runs comprises a frame; a rotating shaft; a plurality of tools that protrude from the shaft; a casing arranged around the shaft and delimiting a processing chamber in which the snow is processed by the tools; and a finisher that, in this case, comprises a pressure bar and a flexible mat, which is connected to one end of the casing and has the function of compacting the tilled snow.
  • the snow tiller is generally dragged over the snow cover by a tracked vehicle in a traveling direction by means of a drawbar.
  • the snow tiller rests on the snow cover, in this case, the snow tiller rests on the finisher and, at the front, is supported by the drawbar, which is, in turn, connected to and controlled by the tracked vehicle.
  • Document CN 106884401 discloses a snow tiller for keeping the flexible mat permanently in contact with the snow cover.
  • Document DE 4101617 discloses a levelling device for snow surfaces, in particular for the preparation and/or maintenance of ski slopes.
  • the properties of a ski run's snow cover such as the thickness and mechanical properties of the snow, vary within very wide ranges depending on the weather conditions. Therefore, the optimal preparation of a ski run is conditioned by the properties of the snow cover itself, which can vary considerably both depending on the area of the processed run and over short periods of time.
  • the optimal preparation of a ski run involves eliminating irregularities in the snow cover in order to achieve an aesthetically pleasing snow cover.
  • This operation is particularly complicated, given the considerable variability of the snow cover properties, e.g. in the case of ski runs that have both areas of frozen snow cover and areas of soft snow cover.
  • the purpose of the present invention is to provide a snow tiller that mitigates the drawbacks of the prior art.
  • a snow tiller for the preparation of the snow cover of ski runs according to claim 1.
  • the snow tiller is configured to be advanced in a traveling direction and comprising:
  • the controlled adjustment of the distance between the pressure bar and the casing makes it possible to adjust the configuration of the flexible mat portion between the pressure bar and the casing, which can selectively determine an accumulation of a suitable amount of tilled snow between the pressure bar and the casing to fill in irregularities in the snow cover in order to obtain an aesthetically pleasing snow cover.
  • the portion of flexible mat between the pressure bar and the casing can take on a plurality of configurations between an extended configuration, to be used in fresh snow conditions, and an arched configuration, with a concavity facing upwards, to increase the accumulation of snow in the processing chamber and the levelling of irregularities in the snow cover. This second configuration is to be used when there is compact snow.
  • the present invention enables an optimal and aesthetically pleasing snow cover to be obtained, in the case of ski runs that have both areas of frozen snow cover and areas of soft snow cover.
  • the free oscillation of the pressure bar around an axis parallel to the longitudinal axis is independent with respect to the tiller module and enables the pressure bar and the flexible mat to adapt to the transverse profile of the snow cover, even when the snow cover has close variations in the traveling direction.
  • the crossbar and the pressure bar it is possible to enable the crossbar and the pressure bar to freely oscillate around an axis passing through the spherical joint and substantially parallel to the longitudinal axis and the crossbar and pressure bar to oscillate in a controlled manner around an axis passing through the spherical joint and transverse to the longitudinal axis.
  • the rear end of the casing, to which the flexible mat is coupled is slightly higher than the pressure bar.
  • the adjusting assembly is configured to selectively control the pressure bar's oscillating around an axis transverse to the longitudinal axis in order to adjust the distance between the pressure bar and the casing.
  • the adjusting assembly comprises a linear actuator coupled to the frame by means of a first universal joint and coupled to the crossbar by means of a second universal joint.
  • the linear actuator is, in this embodiment, configured to control the crossbar's oscillating around an axis passing through the spherical joint transversal to the longitudinal axis in order to adjust the distance between the pressure bar and the casing.
  • the first universal joint comprises an articulated head and/or the second universal joint comprises an articulated head.
  • the pressure bar is coupled to the crossbar and to the flexible mat so as to allow a substantially translatory movement of the pressure bar along a direction substantially parallel to the longitudinal axis.
  • the pressure bar is made up of sections, which are rigid and coupled to each other so as to enable small relative oscillations between the sections with respect to axes substantially parallel to the longitudinal axis, the cross bar being connected to each section by a connecting element shaped like an articulated head.
  • the cross bar is coupled to the pressure bar so that the cross bar and the pressure bar are configured to oscillate solidly around an axis passing through the spherical joint and transverse to the longitudinal axis.
  • the linear actuator comprises a double-acting hydraulic cylinder controlled by force.
  • the number 1 indicates a snow tiller 1, as a whole, for the preparation of the snow cover on ski runs.
  • the snow tiller 1 mainly extends symmetrically on opposite sides with respect to a longitudinal axis A1 and is configured to be dragged over the snow cover in a traveling direction D1 by means of a tracked vehicle (not shown in the attached figures).
  • the snow tiller 1 is connected by means of a drawbar (not shown in the attached figures) to the tracked vehicle (not shown).
  • front will specifically refer to the traveling direction D1 of the snow tiller 1.
  • the snow tiller 1 comprises a frame 2; two tiller modules 3 (one of which is not shown) supported by the frame 2 and substantially aligned in a transverse direction with respect to the longitudinal axis A1; a finisher 4 at the rear; and an adjusting assembly 5 for each tiller module 3.
  • the frame 2 comprises a front hitch 6 configured to be connected to the drawbar (not shown in the attached figures); a support bar 7; two forks 8, each of which is configured to support a respective tiller module 3 and to enable small oscillations of the tiller module 3 around an axis parallel to the longitudinal axis A1.
  • Each tiller module 3 is suspended from the respective fork 8, so that it can oscillate, and is hinged to the adjacent tiller module 3 so that the snow tiller 1 is able to adapt to the ground hollows transverse to the traveling direction D1.
  • the frame 2 comprises a support 9 coupled to a respective fork 8 and configured to support the adjusting assembly 5.
  • Each tiller module 3 comprises a motorised shaft 10, which rotates around a rotation axis A2 that extends in a direction substantially transversal to the longitudinal axis A1 and is equipped with a plurality of tools 11 configured to penetrate the snow cover; and a casing 12 arranged around the shaft 10 and configured to define a processing chamber 13 in which the snow is processed.
  • the casing 12 also has a bearing function to support the shaft 10 and to connect the tiller module 3 to the frame 2.
  • the finisher 4 comprises a flexible mat 14 coupled to the casing 12 to define the continuation of the casing 12; and a pressure bar 15 that extends in a direction transverse to the longitudinal axis A1 and is fixed above the flexible mat 14.
  • the flexible mat 14 comprises a portion 16 that extends from the casing 12 to the pressure bar 15 and can be configured according to the distance between the pressure bar 15 and the casing 12.
  • the pressure bar 15 is made up of sections 17, which are rigid and coupled to each other so as to enable small relative oscillations between adjacent sections 17 around axes substantially parallel to the longitudinal axis A1 and, thus, to adapt the pressure bar 15 and the flexible mat 14 to the irregularities and undulations of the snow cover transversely to the traveling direction D1.
  • the sections 17 are made of metallic material, especially aluminium.
  • the adjusting assembly 5 comprises a crossbar 18 that extends transversely to the longitudinal axis A1 directly above the pressure bar 15, and is coupled to the pressure bar 15 and to the support 9.
  • crossbar 18 is connected to each section 17 of the pressure bar 15 by means of respective connecting elements 19.
  • each connecting element 19 comprises an articulated head so as to enable small independent oscillations of each section 17 of the pressure bar 15 around a plurality of axes passing through the respective articulated head.
  • the adjusting assembly 5 comprises a universal joint 20 to connect the crossbar 18 to the support 9, and a linear actuator 21, which is coupled to the frame 2 by means of a universal joint 22 and to the crossbar 18 by means of a universal joint 23.
  • the linear actuator 21 is a hydraulic cylinder selectively controlled by force and in a position to adjust the distance between the pressure bar 15 and the casing 12.
  • the snow tiller 1 comprises two adjusting assemblies 5, in which each linear actuator 21 is coupled to the respective fork 8 and in which each crossbar 18 is coupled to the respective support 9.
  • a housing for the universal joint 20, which is a spherical joint, is located in the central portion of the body of the crossbar 18.
  • the linear actuator 21 is a double-acting hydraulic cylinder the ends of which are coupled, respectively, to the frame 2 by means of a universal joint 22 and to the crossbar 18 by means of a universal joint 23.
  • a central portion of the crossbar 18 comprises a seat for connecting to the linear actuator 21 by means of the universal joint 23, which comprises an articulated head.
  • the adjusting assembly 5 enables the selective adjustment of the distance between the pressure bar 15 and the casing 12, by means of adjusting the length of the linear actuator 21.
  • the adjustment of the distance between the pressure bar 15 and the casing 12 enables the configuration of the portion 16 of flexible mat 14, between the pressure bar 15 and the casing 12, to be adjusted, thus varying the amount of snow present in the processing chamber 13.
  • the crossbar 18 rotates counter-clockwise around an axis passing through the universal joint 20 and parallel to the extension direction of the crossbar 18, causing the pressure rod 15 to approach the casing 12.
  • the portion 16 of the flexible mat 14 is compressed and arches, defining a concavity towards the top.
  • the length of the linear actuator 21 is manually controlled by the driver of the tracked vehicle by means of a special control interface arranged in the cab (not shown in the attached figures).
  • the length of the linear actuator 21 is controlled automatically.
  • the length of the linear actuator 21 is controlled according to some parameters detected by special sensors (not shown in the attached figures), preferably according to the properties of the snow cover, the height of the shaft 10 with respect to the snow cover, and the position of the shaft 10 with respect to the casing 12.
  • the universal joint 20 which is a spherical joint, enables the crossbar 18 to oscillate, in a controlled manner, around an axis transverse to the longitudinal axis A1 and passing through the universal joint 20 in order to adjust the distance between the pressure bar 15 and the casing 12.
  • the crossbar 18 also enables the crossbar 18 to oscillate freely around the universal joint 20 to adapt the pressure bar 15 and the flexible mat 14 to the transverse profile of the ski run, independently of the tiller module 3.
  • the flexible mat 14 is able to remain in constant contact with the snow cover, even when the ski run has close variations in the transverse profile in the traveling direction D1.
  • the adaptation of the pressure bar 15 to the snow cover conformation is also favoured by the connecting elements 19 comprising the articulated heads that make it possible for each section 17 to make small independent oscillations around a plurality of axes.
  • a plane P on which the rotation axis A2 lies and passing through the universal joint 20 identifies a first spatial region above the plane P and a second spatial region below the plane P.
  • the linear actuator 21 is arranged in the first spatial region, while the pressure bar 15 and the end of the flexible mat 14, which is connected to the casing 12, are arranged in the second spatial region.
  • the amount of snow contained in the processing chamber 13 can be selectively adjusted so as to enable sufficient snow accumulation, when processing a snow cover, in order to level out irregularities in the snow cover or to avoid excessive amounts of tilled snow in the processing chamber 13 when not required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Soil Working Implements (AREA)
  • Cleaning Of Streets, Tracks, Or Beaches (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Transmission Device (AREA)

Claims (8)

  1. Fraise à neige pour la préparation d'un manteau neigeux des pistes de ski, la fraise à neige (1) étant configurée pour être avancée dans une direction de déplacement (D1) et comprenant :
    - un châssis (2) s'étendant de manière symétrique sur les côtés opposés d'un axe longitudinal (A1) parallèle à la direction de déplacement (D1) ;
    - au moins un module de fraise (3) couplé au châssis (2) et comprenant un arbre (10) qui tourne autour d'un axe de rotation (A2) transversal à l'axe longitudinal (A1) et est équipé d'une pluralité d'outils (11) configurés pour pénétrer le manteau neigeux ; et un carter (12) qui est agencé autour de l'arbre (10) et délimite une chambre de traitement dans laquelle la neige est traitée ;
    - un finisseur (4) qui comprend un tapis flexible (14) qui est configuré pour définir une zone de support pour la fraise à neige (1) sur le manteau neigeux et comprend une extrémité couplée au carter (12) ; et une barre de pression (15) qui s'étend de manière transversale par rapport à l'axe longitudinal (A1), et est fixée sur le tapis flexible (14) à une distance de l'extrémité couplée au carter (12) ; et
    - au moins un ensemble de réglage (5) raccordé à la barre de pression (15) et au châssis (2) et/ou au carter (12) et configuré pour permettre une oscillation libre de la barre de pression (15) autour d'un axe parallèle à l'axe longitudinal (A1) de la fraise à neige (1) et régler sélectivement la distance entre la barre de pression (15) et le carter (12), de sorte que la partie du tapis flexible (14) entre la barre de pression (15) et le carter (12) peut adopter une pluralité de configurations entre une configuration étendue, destinée à être utilisée dans des conditions de neige fraîche, et une configuration arquée, avec une concavité orientée vers le haut, pour augmenter l'accumulation de neige dans la chambre de traitement (13) et le nivelage des irrégularités dans le manteau neigeux ;
    dans laquelle le au moins un ensemble de réglage (5) comprend une barre transversale (18) qui s'étend de manière transversale par rapport à l'axe longitudinal (A1) et est couplée à la barre de pression (15) et, au moyen d'un joint sphérique (20), au châssis (2) ;
    dans laquelle un plan (P) sur lequel l'axe de rotation (A2) se trouve et passant par le joint sphérique (20) identifie une région spatiale sous le plan (P) ; la barre de pression (15) et l'extrémité du tapis flexible (14) couplées au carter (12) étant agencées dans ladite région spatiale.
  2. Fraise à neige selon la revendication 1, dans laquelle l'ensemble de réglage (5) est configuré pour contrôler sélectivement l'oscillation de la barre de pression (15) autour d'un axe transversal à l'axe longitudinal (A1) pour régler la distance entre la barre de pression (15) et le carter (12).
  3. Fraise à neige selon la revendication 1 ou 2, dans laquelle l'ensemble de réglage (5) comprend un actionneur linéaire (21) couplé au châssis (2) au moyen d'un premier joint universel (22) et couplé à la barre transversale (18) au moyen d'un deuxième joint universel (23) ; l'actionneur linéaire (21) étant configuré pour contrôler une oscillation de la barre transversale (18) autour d'un axe passant par le joint sphérique (20) et transversal par rapport à l'axe longitudinal (A1) pour régler la distance entre la barre de pression (15) et le carter (12).
  4. Fraise à neige selon la revendication 3, dans laquelle le premier joint universel (22) comprend une tête articulée et/ou le deuxième joint universel (23) comprend une tête articulée.
  5. Fraise à neige selon l'une quelconque des revendications précédentes, dans laquelle la barre de pression (15) est couplée à la barre transversale (18) et au tapis flexible (14) afin de permettre un mouvement sensiblement de translation de la barre de pression (15) le long d'une direction sensiblement parallèle à l'axe longitudinal (A1).
  6. Fraise à neige selon la revendication 5, dans laquelle la barre de pression (15) est composée de sections (17) qui sont rigides et couplées entre elles afin de permettre des oscillations relatives entre les sections (17) par rapport aux axes sensiblement parallèles à l'axe longitudinal (A1) ; la barre transversale (18) étant raccordée à chaque section (17) par un élément de raccordement (19) formé comme une tête articulée.
  7. Fraise à neige selon l'une quelconque des revendications précédentes, dans laquelle la barre transversale (18) est couplée à la barre de pression (15) de sorte que la barre transversale (18) et la barre de pression (15) sont configurées pour osciller de manière solidaire entour d'un axe passant par le joint sphérique (20) et transversal par rapport à l'axe longitudinal (A1).
  8. Fraise à neige selon l'une quelconque des revendications 3 à 7, dans laquelle l'actionneur linéaire (21) comprend un cylindre hydraulique à double effet contrôlé en force.
EP20705119.4A 2019-02-12 2020-02-12 Fraise à neige pour la préparation de pistes de ski Active EP3924552B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102019000002017A IT201900002017A1 (it) 2019-02-12 2019-02-12 Fresa da neve per la preparazione di piste da sci
PCT/IB2020/051142 WO2020165799A1 (fr) 2019-02-12 2020-02-12 Fraise à neige pour la préparation de pistes de ski

Publications (3)

Publication Number Publication Date
EP3924552A1 EP3924552A1 (fr) 2021-12-22
EP3924552C0 EP3924552C0 (fr) 2025-01-15
EP3924552B1 true EP3924552B1 (fr) 2025-01-15

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Application Number Title Priority Date Filing Date
EP20705119.4A Active EP3924552B1 (fr) 2019-02-12 2020-02-12 Fraise à neige pour la préparation de pistes de ski

Country Status (6)

Country Link
US (1) US12221755B2 (fr)
EP (1) EP3924552B1 (fr)
CN (1) CN113728139A (fr)
CA (1) CA3129287A1 (fr)
IT (1) IT201900002017A1 (fr)
WO (1) WO2020165799A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022200466B4 (de) * 2022-01-18 2024-08-01 Kässbohrer Geländefahrzeug Aktiengesellschaft Pistenraupe mit einem Fahrerhaus sowie mit einer Heckfräse und Heckfräse für eine Pistenraupe mit einem Fahrerhaus
DE102022208600A1 (de) * 2022-08-18 2024-02-29 Kässbohrer Geländefahrzeug Aktiengesellschaft Heckfräse für eine Pistenraupe sowie Pistenraupe

Citations (1)

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Publication number Priority date Publication date Assignee Title
DE4101617A1 (de) * 1990-01-22 1991-07-25 Bombardier Inc Planiergeraet fuer schneeflaechen und verfahren zur aufbereitung und/oder pflege einer schneeflaeche

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DE8536530U1 (de) * 1985-12-24 1986-04-24 Karl Kässbohrer Fahrzeugwerke GmbH, 7900 Ulm Schneefräse
US4788783A (en) * 1987-03-24 1988-12-06 Bachler Anton R Ski-track forming apparatus
US5067264A (en) * 1987-04-21 1991-11-26 Logan Manufacturing Company Flexible rotary snow tiller
US4897941A (en) * 1988-08-21 1990-02-06 Logan Manufacturing Company Snow grooming comb
DE9217472U1 (de) * 1992-12-21 1993-02-25 Karl Kässbohrer Fahrzeugwerke GmbH, 7900 Ulm Pistenpflegevorrichtung
DE102006057272B4 (de) * 2006-11-23 2011-11-10 Kässbohrer Geländefahrzeug AG Pistenpflegevorrichtung für ein Kraftfahrzeug, insbesondere ein Kettenfahrzeug
ITMI20070565A1 (it) * 2007-03-21 2008-09-22 Prinoth Spa Fresa per la preparazione del manto nevoso delle piste da sci
ITMI20071783A1 (it) * 2007-09-14 2009-03-15 Rolic Invest Sarl Fresa rotante da neve per la preparazione del manto nevoso delle piste da sci
ITUA20162388A1 (it) 2016-04-07 2017-10-07 Prinoth Spa Apparato per realizzare una pista da sci di fondo
CN106884401B (zh) * 2017-04-07 2018-07-03 广西玉林悍牛工程机器有限公司 压雪车雪犁刮板压实装置
CN207582403U (zh) 2017-10-24 2018-07-06 北京宾度明德滑雪设备有限公司 一种雪道平整车
IT201800003000A1 (it) * 2018-02-23 2019-08-23 Prinoth Spa Fresa da neve e relativo metodo di regolazione

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
DE4101617A1 (de) * 1990-01-22 1991-07-25 Bombardier Inc Planiergeraet fuer schneeflaechen und verfahren zur aufbereitung und/oder pflege einer schneeflaeche

Also Published As

Publication number Publication date
EP3924552C0 (fr) 2025-01-15
US20220106750A1 (en) 2022-04-07
CN113728139A (zh) 2021-11-30
WO2020165799A1 (fr) 2020-08-20
CA3129287A1 (fr) 2020-08-20
EP3924552A1 (fr) 2021-12-22
IT201900002017A1 (it) 2020-08-12
US12221755B2 (en) 2025-02-11

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